package com.atguigu.eduservice.service.impl;

import com.atguigu.eduservice.entity.EduChapter;
import com.atguigu.eduservice.entity.EduVideo;
import com.atguigu.eduservice.entity.chapter.ChapterVo;
import com.atguigu.eduservice.entity.chapter.VideoVo;
import com.atguigu.eduservice.mapper.EduChapterMapper;
import com.atguigu.eduservice.service.EduChapterService;
import com.atguigu.eduservice.service.EduVideoService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2020-12-28
 */
@Service
public class EduChapterServiceImpl extends ServiceImpl<EduChapterMapper, EduChapter> implements EduChapterService {

    @Autowired
    private EduVideoService videoService; //注入小节service

    //课程大纲列表 ,根据课程id进行查询
    @Override
    public List<ChapterVo> getChapterVideoByCourseId(String courseId) {
       //1.根据课程id查询出课程里面的所有章节
        QueryWrapper<EduChapter> wrapperChapter=new QueryWrapper<>();
        wrapperChapter.eq("course_id",courseId);
        List<EduChapter> eduChapterList=baseMapper.selectList(wrapperChapter);

        //2根据课程id查询课程里面所有的小节
        QueryWrapper<EduVideo> wrapperVideo=new QueryWrapper<>();
        wrapperChapter.eq("course_id",courseId);
        List<EduVideo> eduVideoList=videoService.list(wrapperVideo);

        //创建list集合，用于最终封装数据
        List<ChapterVo> finalList=new ArrayList<>();
        //3 遍历查询章节list集合进行封装
        //遍历查询章节list集合
        for (int i=0; i<eduChapterList.size(); i++){
            //每个章节
            EduChapter eduChapter=eduChapterList.get(i);
            //eduChapter 对象的值复制到ChapterVo里面
            ChapterVo chapterVo=new ChapterVo();
            BeanUtils.copyProperties(eduChapter,chapterVo);
            finalList.add(chapterVo);

            //创建集合,用于封装章节的小节
            List<VideoVo> videoList=new ArrayList<>();

            //4 遍历查询小节list集合,进行封装
            for(int m=0; m<eduVideoList.size(); m++){
                //得到每个小节
                EduVideo eduVideo=eduVideoList.get(m);
                //判断:小节里面chapterid和章节里面id是否一样
                if (eduVideo.getChapterId().equals(eduChapter.getId())){
                    //进行封装
                    VideoVo videoVo=new VideoVo();
                    BeanUtils.copyProperties(eduVideo,videoVo);
                    //放到小节封装集合
                    videoList.add(videoVo);
                }
            }
            //把封装之后小节list集合，放到章节对象里面
            chapterVo.setChildren(videoList);
        }
        return finalList;
    }

    //删除章节的方法
    @Override
    public boolean deleteChapter(String chapterId) {
        //根据chapterid章节id 查询小节表，如果查询出数据，不进行删除
       QueryWrapper<EduVideo> wrapper=new QueryWrapper<>();
       wrapper.eq("chapter_id",chapterId);
       int count=videoService.count(wrapper);

       //判断
        if(count>0){ //查询出小节 不删除数据
             throw new GuliException(20001,"不能删除");
        }else{ //不能查出数据，进行删除
        //删除章节
         int result=baseMapper.deleteById(chapterId);
         //成功 1>0   0>0
         return result>0;

        }
    }

    //2根据课程id删除章节
    @Override
    public void removeChapterByCourseId(String courseId) {
       QueryWrapper<EduChapter> wrapper=new QueryWrapper<>();
       wrapper.eq("course_id",courseId);
       baseMapper.delete(wrapper);
    }
}
